Rather than decorators, docs recommend this pattern.

01_component.js

import React from 'react';
import { connect } from 'react-redux';
import ProductBody from 'components/ProductBody';

// Export named for testing
export const Product = ({
  product
}) => (
  <div className="product">
    <h1>{product.get('title')}</h1>
    <ProductBody product={product} />
  </div>
);

const mapStateToProps = (state, props) => ({
  product: state.getIn(['entities', 'products', props.params.productId])
});

// Export "decorated" for implementation
export default connect(mapStateToProps)(Product);

02_test.js

import React from 'react';
import { Product } from 'components/Product'; // By importing the named component you don't have to deal with store availability.

// etc. etc.